CA2337228A1 - Method and apparatus for imaging earth formation - Google Patents

Method and apparatus for imaging earth formation Download PDF

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Publication number
CA2337228A1
CA2337228A1 CA002337228A CA2337228A CA2337228A1 CA 2337228 A1 CA2337228 A1 CA 2337228A1 CA 002337228 A CA002337228 A CA 002337228A CA 2337228 A CA2337228 A CA 2337228A CA 2337228 A1 CA2337228 A1 CA 2337228A1
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Canada
Prior art keywords
buttons
formation
current
array
ratio
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CA002337228A
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French (fr)
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CA2337228C (en
Inventor
Min-Yi Chen
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Schlumberger Canada Ltd
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Individual
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Publication of CA2337228A1 publication Critical patent/CA2337228A1/en
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Publication of CA2337228C publication Critical patent/CA2337228C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
    • G01V3/20—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with propagation of electric current

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The borehole imaging apparatus of the present invention includes a tool having an array of voltage electrode buttons (32a, b, ...) mounted on a non-conductive pad (30). A current source (34, 38) and a current return (36, 40) are preferably located on the non-conductive pads at opposite ends thereof.
The locations of the current source (34, 38) and return (36, 40) are designed to force a current to flow in the formation parallel to the pad face and non-parallel to the formation boundary layers. According to a method of the invention, the voltage difference between a pair of buttons in the array is proportional to the resistivity of the formation bed adjacent to the buttons. The ratio of voltage differences between two nearby pairs of electrode buttons provides a quantitative measurement of the ratio of shallow resistivity. The resolution of the image produced by the new tool is determined only by the spacing of the buttons.
CA002337228A 1998-07-15 1999-06-25 Method and apparatus for imaging earth formation Expired - Fee Related CA2337228C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/116,017 1998-07-15
US09/116,017 US6191588B1 (en) 1998-07-15 1998-07-15 Methods and apparatus for imaging earth formation with a current source, a current drain, and a matrix of voltage electrodes therebetween
PCT/US1999/014420 WO2000004405A1 (en) 1998-07-15 1999-06-25 Method and apparatus for imaging earth formation

Publications (2)

Publication Number Publication Date
CA2337228A1 true CA2337228A1 (en) 2000-01-27
CA2337228C CA2337228C (en) 2008-06-17

Family

ID=22364759

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002337228A Expired - Fee Related CA2337228C (en) 1998-07-15 1999-06-25 Method and apparatus for imaging earth formation

Country Status (5)

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US (1) US6191588B1 (en)
EP (1) EP1112514A1 (en)
AU (1) AU4720199A (en)
CA (1) CA2337228C (en)
WO (1) WO2000004405A1 (en)

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Also Published As

Publication number Publication date
WO2000004405A1 (en) 2000-01-27
EP1112514A1 (en) 2001-07-04
CA2337228C (en) 2008-06-17
AU4720199A (en) 2000-02-07
US6191588B1 (en) 2001-02-20

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